Precipitation and thermal instability of M₂₃C₆ carbide in cast Ni-base superalloy K452

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• 作者：X.Z. Qin ; J.T. Guo ; C. Yuan ; J.S. Hou ; H.Q. Ye
• 关键词：Ni-base superalloy ; M₂₃C₆ carbide ; Thermal exposure ; Thermal instability ; Tensile property
• 刊名：Materials Letters
• 出版年：2008
• 出版时间：31 January 2008
• 年：2008
• 卷：62
• 期：2
• 页码：258-261
• 全文大小：732 K

文摘

During long-term thermal exposure M₂₃C₆ dendritically precipitates from the supersaturated γ matrix and then changes in shape from flower-like dendrite to irregular block to regular polyhedron. The reduction in the interfacial energy is responsible for the morphological transition, but the stable morphology of the carbide is principally determined by the anisotropy of the interfacial energy between the carbide and the γ' in the M₂₃C₆-γ' cell. In addition, M₂₃C₆ has a negligible influence on the tensile property of the thermally exposed alloy even though it can block the mobile dislocations and stacking faults to some extent.